Production of metal-containing dyestuffs



United States Nd Drawing. Filed Dec. 18,1957, Ser.No.703,496 Claims priority, application Germany Dec. 22, 1956 Claims. (Cl. 260-146) This invention relates .to new dyestuffs and in particular to metal-containing water-soluble dyestuffs-free from sulfonic acid groups which contain for each metal atom two monoazo and/or azomethine dyestuifs and which moreover carry at least once the grouping:

in which .n represents one of the whole numbers 3 to 7 For the sake of simplicity, this group is indicated hereinafter by the left of the two tautomeric formulae.--

The new dyestuffs. follow the general formula:

Xbeing the radical of a monoazo dyestufi of the general formula:

(wherein A represents the radical of an aniline free from sulfonic acid groups which bears in ortho-position to the amino group a complex-forming group, B the radical of a coupling component free from sulfonic acid groups, which contains a hydroxyl, a primary or a secondary amino group and couples in adjacent position thereto, m one of the numbers 1 or 2 and n an integer of from 3 to 7), Y either also the radical of a monoazo dyestuff of the above mentioned general Formula II or "that of any other azo or azomethine dyestufi free from sulfonic acid groups, M a metal atom of one of the atomic numbers 24 to 29 and Q the equivalent of a cation as for example of the hydrogen, sodium, potassium or ammonium ion. As complex-forming groups in the general Formula II there come into question for example hydroxyl, alkoxyl, carboxyl and toluene-sulfonic acid ester groups.

The production of these new dyestufis can lie-carried out in several Ways:

(1) Monoazo dyestufis of the general Formula II or mixtures thereof withcach other or mixtures of such dye stuffs with any other azo or azomethine dyestuffs can be converted by known methods, either by themselves or in the dyebath or on the fiber, into theirlzl-metal complex compounds, derived from metals of an atomic number 2,054,370 Patented Sept. 27, 1960 are tained by reaction of diazotized aromatic .amines free from sulionic acid groups which have in ortho' -position to the amino group a group sensitive to metal, witharomade or heterocyclic hydroxyl, primary or secondary amino compounds orenols free from, sulfonicacid groups and coupling in adjacent position to the hydroxyl or amino groups, the diazo and/or coupling components being chosen so that the monoazo dyestufl formed contains at least one-cyclic sulfonylamidine group.

Suitable azo components which contain a cyclic sulfonylamidine groupof the above tautomeric'formula are obtained for example by acting on aromaticor heterocyclic hydroxyl compounds free from sulfonic acid groups or on enols which have an unsubstituted sulfonic acid amide groups, with lactim-O-alkyl ethers in a molar amount at least corresponding to the sulfonic acid amide groups present, the following reaction thereby taking place (see Angewandte Chemie, volume 64 (1952), page 602):

In this formula R represents the radical of an azo-component capable of coupling, R an alkyl group andn one of the whole numbers 3 to 7. i e

For the production of suitable diazo components it is preferable to start from aromatic compounds which contain besides at least one'unsubstituted sulfonic acid amide group, a substitue-nt capable of conversion into an amino group, for example a 'nitro or acylamino group, in orthoposition to a complex-forming group, to react this with a lactim-O-alkyl ether in the sense of the above scheme of formulae and then to convert the substituent into the amino group. Thus'for example l-nitro-lZ-hydroxybenzene-S-sulfonic acid amide may be reacted with capro'lactim-O-methyl ether and the resultant cyclic sulfonylamidine reduced catalytically or with iron and acid to the 1 amino-2 hydroxybenzene-S-sulfonic acid amide derivative of the formula:

which isthen diazotized and coupled.

Both the diazo and coupling component used may contain further non-ionogenic substituents, such as halogen atoms, cyano, alkyl, alkoxy; nitro, trifiuoromethyl, sulfonic acid amide (possibly substituted), carboxylic acid amide and/ or sulfonic acid groups.

Instead of caprolactim-O-methy-l ether, there may be used for the conversion of the sulfonic acid amide groups into cyclic sulfouylamidine groups, for example, the 0- methyl, O-ethyl, O-propyl or O-hexyl ethers of the lac- .tinl forms of pyrrolidone, piperidone, oenanthic lactam or capryllic lactam or their C-alkyl derivatives. The reaction between the lactim-O-allcyl ethers and the compounds containing unsubstituted sulfonic acid amide groups preferably takes place in indifferent diluents, such as alcohols, ethers, amides of low molecular weight carboxylic acids such as formamide, d'imethylformtamide or N-methylpyrrolidoue, and may be accelerated'by small amounts of basic catalysts, such as pyridine or triethylamine. The reaction is carried out at a temperature range of between 50 and 160 0, preferably between 60 and C.

(b) Similarly monoazo dyestuffs of the general Formula H can be prepared by reaction of monoazo dyestufis of the general formula in which A, B and m have the above-mentioned significance, with at least m mols of the said lactim-O-alkyl ethers according to the said methods. Here also the reaction proceeds in the sense of the above reaction scheme, i.e. by conversion of the sulfonic acid amide group into the cyclic sulfonylamidine group. As initial materials for this purpose there are suitable all o.o'-dihydroxy-, o-hydroxy-o'-alkoxy, o-hydroxy-o-carboxyor o-hydroxy-o'-amino-azo dyestuffs which are free from sulfonic acid groups. They may also contain the abovementioned non-ionogenic groups or atoms.

(2) The new dyestuffs may also be obtained by reaction of the 1:2-metal complexes derived from metals of the atomic numbers 24 to 29 which contain at least one monoazo dyestuff of the above general Formula III with at least m mols of one of the said lactim-O-alkyl ethers according to the said methods. Here also A and B may bear the said non-ionogenic substituents. There may be used 1:2-metal complexes which contain two indentical or two different azo dyestuffs of the general Formula III, and also complexes which contain besides one of the said azo dyestuffs also any other azo or azomethine dyestuff.

The new metal-containing dyestuffs thus obtainable in general dissolve well in organic solvents, lacquers and resins. They can therefore be used for coloring lacquers, and also fibers and other structures, for example consisting of polyesters and cellulose esters. Furthermore they go onto wool and fibers and other structures of synthetic polyamide from a weak acid to weak alkaline bath and are therefore suitable for dyeing, padding and printing of the said structures and furthermore, of mixed fabrics of wool and synthetic fibers. The fastness to light of the dyeings on wool is just as good as that of the corresponding dyestuffs containing unsubstituted sulfonic acid amide groups. The absorptive power of the new metal complex dyestuifs containing cyclic sulfonylamidine groups is however considerably better than that of the known dye- III.

stuffs; furthermore the new dyestuffs exhibit better fastness properties with respect to wet treatment with alkalies.

The following examples will further illustrate this invention but the invention is not restricted to these examples. The parts specified in the examples are parts by weight, unless otherwise specified.

Example 1 25.0 parts of Z-hydroxynaphthalene-6-sulfonic acid amide are stirred into 100 parts of ethanol; then 10 parts by volume of pyridine and 16.5 parts of caprolactim-O- methyl ether are added, and the whole heated under reflux on the water-bath for eight hours. The still hot solution is introduced into a mixture of 300 parts of icewater and 20 parts of caustic soda solution and then a diazo solution prepared by diazotizing 15.0 parts of 1- amino-2-hydroxy-5-chlorbenzene in the usual way is stirred in.

The precipitated azo dyestuif is filtered off by suction, washed, pressed out and then stirred with 1,000 parts of water and 16.0 parts of 50% caustic soda solution and dissolved by heating. An aqueous solution of 12.5 parts of crystallized coba1t(II) chloride and 15.0 parts of crystallized sodium acetate or potassium acetate are added and the reaction mixture stirred at C. until the formation of the complex is completed.

After cooling,'the finished cobalt-containing dyestulf is filtered off by suction, washed with water and dried in vacuo at 50 C.

The new cobalt-containing dyestufl, which is obtained in the form of the sodium or the potassium salt of a complex acid containing azo dyestufi radicals to each cobalt atom, dissolves in alcohols with a red-violet color and dyes wool and polyamide fibers red-violet shades of very good fastness to light and moisture from neutral or acetic acid aqueous dispersion.

If the metal-free dyestufi is reacted in known manner with a solution of chromium(III)formate, instead of which cobalt(II) chloride, the corresponding chromiumcontaining dyestuif is obtained which dyes wool fast blueviolet shades.

Azo dyestuffs of which the l:2 -metal complex compounds give the specified shade on wool are obtained in a corresponding way from the components listed below:

Diazo component Coupling component Metal Shade ('31 OH HO NH: Chr0mium... Navy blue.

CHz-CHrCH:

SOr-NH-C NCHz-CH:

OH HO HBCPOQSQNH: Cobalt Red-violet.

CHz-CHg-CH;

SOr-NH-C NCH:CH1

OH HO @N'Ha ----.d0 Bordeaux. HIC-HN-OgS CH2CH2CH2 SO -NH-C N-CH:OH2

Dlazo component 7 Coupling component Metal Shade 7 OCH; HO Cobalt 3 Bordeaux.

w r 1 V. i/CHrCHr-Cfiz so,NH-o N-CHz- H:

on NH: {Cobalt Violet.

.; Y Chromium.--. Reddishblue.

1 CHz-CHr-CHi C-HN--O S HT'QHT-N HO NH: '{Cobalt Red Violet. v Ohronu'um "Bluish violet. 6 N-O3S CHr-CHrCHz C-HN-OzS H2-CHa----1 T our on HO NH: N Chrmium Bluishred.

I /CHgCH2-CH2 s H: N SOz-NH-C N UHF-CH2 Example 2 109 parts of 1-nitro2-hydroxybenzene-5-sulfonic acid amide are boiled for 5 hours under reflux in 1,000 parts of methanol with 80 parts of caprolactirn-O-methyl ether and 40 5 parts of triethylamine. Then about half of the methanol is distilled off and the residue stirred into 1,000 parts of water. The reaction product. precipitated as a yellow resin is well kneaded with the water, and the liquid is then neutralized with hydrochloric acid.

After Washing and kneading thoroughly several times each time with fresh water, the resinous product is dissolved in 400' parts of methanol and, after the addition I of parts Raney nickel, hydrogenated at 100, C. and a hydrogen pressure of 100 atmospheres excess pressure until the 'endof the absorption of hydrogen. I 100 parts of the cyclic sulfonylamidine ofthe formula NHz CHrCHz-CH: I C-HN-OzS CHr-CHrN are obtained. I

parts of this compound are dissolved in 200 parts of water. The solution is clarified with 2 parts of active carbon and filtered. 25 parts of l0-normal hydrochloric acid are added to the filtrate and diaz'otized with a solution of 7 parts of sodium nitrite in 20 parts of water, part of the diazo compound formed thus separating in crys talline form. The diazotization mixture is stirred into a mixture of 17 parts of Z-hydroxynaphthalene, 200 parts of water, 44 parts of 10% caustic soda solution and 16 parts of anhydrous sodium carbonate. After the end of the coupling, it is neutralized and the dyestufi formed is filtered off by suction and washed withwater.

The dyestuff paste thus prepared is stirred with '600 parts of water and mixed with 68- parts of 25% ammonia solution, whereupon at 70 C. a solution of 14.4 parts of crystallized cobalt(II) chloride is introduced. After stirring for two hours at to C., the reaction mix? ture is diluted with 500 parts of water and the cobalt containing complex dyestuif .as an ammonium salt is filtered off by suction and dried at 60 C. in vacuo, where- Shade of the 1:2-

Metal-free dyestufi Metal metal-complex onwool Chr0mium Bluish-red.

Shade 01' the 1:2- Metal-free dyestufl Metal metal-complex on wool Ohromlum. Blu1sh-red.

N= Clair-011 051 N C-EN-OaS B 8 HgCH:-N

' OH HO l fin Bordaauxreda N: CHz-CHr-CH, N

C-HN-OzS H Hr-CH:N

(|)H HO N= Cobalt Do. CHI-CH2 CH: C-HNO:S

CHr-N OH HO N= Chromlum Blue grey. CHr-CHr-CE;

o-nN-ms BIN-Q Ha-CHr-N L C| H HO N: do Bluish violet. CHr-N /CHNO2S iii-om Example 3 40 21 parts of a cobalt-containing dyestufl. are obtained 18 parts of the dyestulf 1amino-2-hydroXybenzene-5- sulfonic acid amide 2-hydroxynaphthalene are dissolved in 300 parts of ethanol and, after the addition of 1 part of triethylamine and 10 parts of caprolactim-O-methyl ether, boiled for 5 hours under reflux while stirring. The reaction mixture is diluted with 150 parts of Water and then 20 parts of 25% ammonia solution and a solution of 7.2 parts of crystallized coba1t(II) chloride in 50 parts of water are added. After again heating to boiling until the end of the formation of the complex, the finished dyestutf is isolated by stirring into 1,000 parts of water and filtering by suction.

which dyes wool bluish-Bordeaux red shades from a neutral or acetic acid bath; the dyeings are very fast to light and moisture.

The same dyestuff is obtained by reacting the 1:2-cobalt complex compound of the above-mentioned initial dyestuif according to Example 1 with caprolactim-O-methyl ether, or by carrying out the condensation with the caprolactim-O-methyl ether and the metallization simultaneously or in any sequence in the same solvent, for example in formamide or in glycol.

In the same way the dyestuffs set out in the followin table may be reacted with caprolactirn-O-alkyl ethers and then converted into the 1:2-metal complex compound:

Shade of the Metal-free dyestuft Metal dyeing of the complex on wool C O OH HO N Chromium Yellow. N=N- N SO:NHI HIC OH HO N-@ ...do Scarlet. N=N

N HgN-OzS OH HO I N@ do Do. HlN-02SN= Shade of the Metal-free dyestufi Metal dyeing orth'e" complex on wool 0 CH3 HO Cobali; Bordeaux red; S O 2-NH do Do.

S 0 2-N 0 Ha) a e O=NN= Cobalt Blue-violet.

Son-NH:

Chromium Reddish blue.

Cobalt Blue.

d n Blue violet.

- d'o Red violet.

S O z-N 0 H3) 2 Example 4 55 a neutral or acetic acid bath;- Tlr'e dyeings have very 20.0 parts of the sodium salt of the 1:2-chromium complex compound of the dyestuff l-amino-Z-hyd-roxybenzene-5'sulfonic acid amide- 1-phenyl-3-methyl-pyr-, azolone-(S) are stirred with 200 parts ofethanoL 'Afier adding 1 part of triethylamine and 12.5 parts of caprolactim-O-methyl ether, it is heated for several hours to boiling under reflux until the separation of a :crystalline precipitate which thereby occurs has proceeded to completion. The new dyestuif is completely precipitated by pouring into 600 parts of cold water. It is'stirred "in the cold until the dyestufi which at first separates in part in a resinous form, has crumbled to a powder, then filtered oil by suction and dried at 50 C. in vacuo.

28 to 30 parts of a chromium-containing dyestulf are obtained which dissolved in alcoholsvor acetone with an orange-red color. and a dispersing agent, for example a hydroxyethylation product of a fatty alcohol, a dyestuff preparation is obtained which dissolves in hot water and dyes wool reddish By mixing with trisodium phosphate good fastness to moisture and in this respect are clearly superior to the initial dyestufi.

Similarly reddish orange dyeings-of very good fastness to light and moisture are obtained on peiyamide fibers from a neutral dyebat'h.

If, instead of reacting the above mentioned chromium complex dyestuif containing 'an unsubstituted sulfonic acid amide group with caprolactim QunethyI-ether, it is reacted in the same way withbutyrolactim-O-methyl-ether, a dyestulf with similar properties le -obtained.

The condensation can alse'be carried out in other solvents, such as formamide, glycol-or mixtures ofacctona and water, as well as in aqueous suspension in the presence of dispersing agents.

In the following table there are given furtherkmono azo dyestufis the 1:2-metaQl-complx compounds of- 'which by reaction with caprolactim-O-methyl other gil le wool dyestufis which go on to wool from a neutral or Weakly acid bath and which haveiimproved fastness properties orange shades which are very fast to-light andlevelfrem 1 in respeetof moisture:

Example 5 iOI) parts of the sodium salt of the mixed 1:2-chromium complex derived from the dyestufis lamino-2- hydroxybenzene-S-sulfonie acid amide- 1-phenyl-3-methyl-pyrazolone-(S) and 1-amino-2-hydroxybenzene 5 sul- 'fonic acid amideZ-hydroxy-naphthalene (mol ratio of the dyestuffs 1:1) are dissolved in 200 parts of boiling ethanol. After the addition of'l part of triethylamine and 10 parts of caprolactim-O-methyl ether, it is heated to boiling under reflux for 5 hours; Then the reaction mixture is poured into 1000 parts of water and the dyev stufi formed is precipitated completely by the additionof saturated sodium chloride solution.

After filtration by suction and drying there are obtained 30 to 33 parts of a dyestufi which dyes wool fast reddish brown shades from a neutral or acetic acid bath.

t id- The dyeings of this dyestuif" on wool differ from those of "the initial dyestutf by considerably better fastness to in a corresponding weak acid solution and have good fastness properties in respect to moisture:

Shade of dyeing 0f Metal-free azo dyestuffs Metal complex dyestufis on wool 1 mol OH HO N=N l I HgN--Oz H3O H I V I and Cobalt Orange-brown. 1 mol OH no OON(C2H6):

HzN--O;S

1 mol OH HO HzN-OgS H30 7 1 Cobalt Reddish-yellow and Chromium Orange '1' mol 7 O H H O Q N=N OzN I HaC 1 mol a C O O H H O N=N l and 1 mol Chromium Green.

OH HO HZN 0 O O C H3 1 mol (|)H H21]? SOzNH: d Cobalt D0.

1 mol OH HO a I CH3 r CNH--C4H9 HN-O2S l Shade of dyeing of Metal-free azo dyestuffs Metal complex dyestuffs on wool 1 mol OaN HO N N=N "N SOzNH: 1 H1 and Chromium Bluish red.

1 mol O|N HO H1N-O1B H:

Example 6 mo'rpholino sulfonyl amino, and lower a-lkylsulfone group table of structural formulae under Example 2 is added The bath is then heated to the boil within 45 minutes, and the boiling temperature maintained for an hour.

After finishing in the usual manner there are obtained strong, very pure greenish blue shades with outstanding fastness to light and wet treatment.

Fastness to rubbing and levelling power can be improved, if no acetic acid is added.

A variant of the dyeing process consists in giving the' fabric into the dyeing bath at a temperature of between 90 and 95 C. after the dyestuif has been added. The dyeing bath is then heated to the boil and the boiling temperature maintained for 30 to 60 minutes.

Example 7 100 parts of a polyamide fabric such as polycaprolactam or polyhexamethylene diamino adipate are added to a dyeing bath consisting of parts of ammonium acetate, 1 to 2 parts of ammonia and 1 to 2 parts of the dyeing assistant mentioned in Example 6 or any other dyeing assistant, in 3,000 parts of water. After 5 minutes 2 parts of the fourth of the dyestuffs listed in the table of structural formulae under Example 1 are added. The dyeing bath is heated to the boil within minutes and the boiling temperature maintained for 2 hours. During the second hour 6 parts of ammonia sulfate is added in small quantities. After finishing in the usual manner vigorous bordeaux shades of good fastness properties are obtained.

We claim:

1. A dyestufl of the general formula X and Y being radicals of a monoazo dyestuif of the general formula II L N=NB and a group of the formula (n being an integer from '3 to 5) and B is a member selected from the group consisting of the radical of 2-hydroxynaphthalene, 2-hydroxy-8-acetyl-a minonaphthalene, 2-hydroxy-8-carbomethoxyaminonaphthalene, N-substi- HaC said monoazo dyestuffs X and Y each containing at the most one substituent of said formula (C 2)u SO2-NH( J l I (n in all cases being an integer from 3 to 5),' M represents a member selected from the group consisting of chromium and cobalt and Q a cation selected from the class consisting of a hydrogen, sodium, potassium and ammonium ion.

2. A member selected from the group consisting of the 1:2 chromium and cobalt complex of the dyestuif of the formula 3. A member selected from the group consisting of the 1:2 chromium and cobalt complex of the dyestuif of the formula a a H? 0 I) Scam-Q 4. A member selected from the group consisting of 17 the 1:2 chromium and cobalt complex of the dyestufi' of the formula OH H 5. A member selected from the group consisting of the 1:2 chromium and cobalt complex of the dyestuff of the formula OH HO 6. A member selected from the group consisting of the 1:2 chromium and cobalt complex of the dyestufi of 7. A member selected from the group consisting of the 1:2 chromium and cobalt complex of the dyestuflf of the formula OH HO N H-C4H0 (011105 N HN O,S

8. A member selected from the group consisting of the 1:2-chromium and cobalt complex of the dyestufi of the formula OH H? G z-CHz-N C O 0 CH! 18 9. A member selected from the group consisting of the 1:2-chromium and cobalt complex of the dyestuif of 10. A member selected from the group consisting of the 1:2-chromium and cobalt complex of the dyestufi of the formula 20 References Cited in the file of this patent UNITED STATES PATENTS 1,979,913 Straub et a1. Nov. 6, 1934 2,012,779 Straub et a1 Aug. 27, 1935 2,711,404 Schetty June 21, 1955 2,749,332 Buehler et al. June 5, 1956 2,784,179 Zickendraht et al. Mar. 5, 1957 2,789,975 Ruckstuhl Apr. 23, 1957 2,804,454 Beffa Aug. 27, 1957 2,814,615 Zickendraht Nov. 26, 1957 2,820,784 Zickendraht et al. Ian. 21, 1958 2,821,524 Maderni et al. Jan. 28, 1958 2,826,572 Kuster et al. Mar. 11, 1958 

1. A DYESTUFF OF THE GENERAL FORMULA 